#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
-#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/spinlock.h>
#include <linux/thermal.h>
+#include "thermal_core.h"
+
/* Register offsets */
#define REG_GEN3_IRQSTR 0x04
#define REG_GEN3_IRQMSK 0x08
#define REG_GEN3_THCODE2 0x54
#define REG_GEN3_THCODE3 0x58
+/* IRQ{STR,MSK,EN} bits */
+#define IRQ_TEMP1 BIT(0)
+#define IRQ_TEMP2 BIT(1)
+#define IRQ_TEMP3 BIT(2)
+#define IRQ_TEMPD1 BIT(3)
+#define IRQ_TEMPD2 BIT(4)
+#define IRQ_TEMPD3 BIT(5)
+
/* CTSR bits */
#define CTSR_PONM BIT(8)
#define CTSR_AOUT BIT(7)
void __iomem *base;
struct thermal_zone_device *zone;
struct equation_coefs coef;
- struct mutex lock;
+ int low;
+ int high;
};
struct rcar_gen3_thermal_priv {
struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
+ unsigned int num_tscs;
+ spinlock_t lock; /* Protect interrupts on and off */
+ const struct rcar_gen3_thermal_data *data;
};
struct rcar_gen3_thermal_data {
#define FIXPT_SHIFT 7
#define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT)
+#define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT)
#define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b))
#define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT)
u32 reg;
/* Read register and convert to mili Celsius */
- mutex_lock(&tsc->lock);
-
reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
val1 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1, tsc->coef.a1);
val2 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2, tsc->coef.a2);
mcelsius = FIXPT_TO_MCELSIUS((val1 + val2) / 2);
- mutex_unlock(&tsc->lock);
-
/* Make sure we are inside specifications */
if ((mcelsius < MCELSIUS(-40)) || (mcelsius > MCELSIUS(125)))
return -EIO;
return 0;
}
+static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc,
+ int mcelsius)
+{
+ int celsius, val1, val2;
+
+ celsius = DIV_ROUND_CLOSEST(mcelsius, 1000);
+ val1 = celsius * tsc->coef.a1 + tsc->coef.b1;
+ val2 = celsius * tsc->coef.a2 + tsc->coef.b2;
+
+ return INT_FIXPT((val1 + val2) / 2);
+}
+
+static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high)
+{
+ struct rcar_gen3_thermal_tsc *tsc = devdata;
+
+ low = clamp_val(low, -40000, 125000);
+ high = clamp_val(high, -40000, 125000);
+
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP1,
+ rcar_gen3_thermal_mcelsius_to_temp(tsc, low));
+
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP2,
+ rcar_gen3_thermal_mcelsius_to_temp(tsc, high));
+
+ tsc->low = low;
+ tsc->high = high;
+
+ return 0;
+}
+
static struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
.get_temp = rcar_gen3_thermal_get_temp,
+ .set_trips = rcar_gen3_thermal_set_trips,
};
+static void rcar_thermal_irq_set(struct rcar_gen3_thermal_priv *priv, bool on)
+{
+ unsigned int i;
+ u32 val = on ? IRQ_TEMPD1 | IRQ_TEMP2 : 0;
+
+ for (i = 0; i < priv->num_tscs; i++)
+ rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQMSK, val);
+}
+
+static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
+{
+ struct rcar_gen3_thermal_priv *priv = data;
+ u32 status;
+ int i, ret = IRQ_HANDLED;
+
+ spin_lock(&priv->lock);
+ for (i = 0; i < priv->num_tscs; i++) {
+ status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR);
+ rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0);
+ if (status)
+ ret = IRQ_WAKE_THREAD;
+ }
+
+ if (ret == IRQ_WAKE_THREAD)
+ rcar_thermal_irq_set(priv, false);
+
+ spin_unlock(&priv->lock);
+
+ return ret;
+}
+
+static irqreturn_t rcar_gen3_thermal_irq_thread(int irq, void *data)
+{
+ struct rcar_gen3_thermal_priv *priv = data;
+ unsigned long flags;
+ int i;
+
+ for (i = 0; i < priv->num_tscs; i++)
+ thermal_zone_device_update(priv->tscs[i]->zone,
+ THERMAL_EVENT_UNSPECIFIED);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ rcar_thermal_irq_set(priv, true);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
static void r8a7795_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
{
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR);
usleep_range(1000, 2000);
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);
+
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2);
+
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN);
usleep_range(1000, 2000);
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2);
+
reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
reg_val |= THCTR_THSST;
rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
+
+ usleep_range(1000, 2000);
}
static const struct rcar_gen3_thermal_data r8a7795_data = {
struct device *dev = &pdev->dev;
struct resource *res;
struct thermal_zone_device *zone;
- int ret, i;
- const struct rcar_gen3_thermal_data *match_data =
- of_device_get_match_data(dev);
+ int ret, irq, i;
+ char *irqname;
/* default values if FUSEs are missing */
/* TODO: Read values from hardware on supported platforms */
if (!priv)
return -ENOMEM;
+ priv->data = of_device_get_match_data(dev);
+
+ spin_lock_init(&priv->lock);
+
platform_set_drvdata(pdev, priv);
+ /*
+ * Request 2 (of the 3 possible) IRQs, the driver only needs to
+ * to trigger on the low and high trip points of the current
+ * temp window at this point.
+ */
+ for (i = 0; i < 2; i++) {
+ irq = platform_get_irq(pdev, i);
+ if (irq < 0)
+ return irq;
+
+ irqname = devm_kasprintf(dev, GFP_KERNEL, "%s:ch%d",
+ dev_name(dev), i);
+ if (!irqname)
+ return -ENOMEM;
+
+ ret = devm_request_threaded_irq(dev, irq, rcar_gen3_thermal_irq,
+ rcar_gen3_thermal_irq_thread,
+ IRQF_SHARED, irqname, priv);
+ if (ret)
+ return ret;
+ }
+
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
for (i = 0; i < TSC_MAX_NUM; i++) {
struct rcar_gen3_thermal_tsc *tsc;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ break;
+
tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
if (!tsc) {
ret = -ENOMEM;
goto error_unregister;
}
- res = platform_get_resource(pdev, IORESOURCE_MEM, i);
- if (!res)
- break;
-
tsc->base = devm_ioremap_resource(dev, res);
if (IS_ERR(tsc->base)) {
ret = PTR_ERR(tsc->base);
}
priv->tscs[i] = tsc;
- mutex_init(&tsc->lock);
- match_data->thermal_init(tsc);
+ priv->data->thermal_init(tsc);
rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[i]);
zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
goto error_unregister;
}
tsc->zone = zone;
+
+ ret = of_thermal_get_ntrips(tsc->zone);
+ if (ret < 0)
+ goto error_unregister;
+
+ dev_info(dev, "TSC%d: Loaded %d trip points\n", i, ret);
}
+ priv->num_tscs = i;
+
+ if (!priv->num_tscs) {
+ ret = -ENODEV;
+ goto error_unregister;
+ }
+
+ rcar_thermal_irq_set(priv, true);
+
return 0;
error_unregister:
return ret;
}
+static int __maybe_unused rcar_gen3_thermal_suspend(struct device *dev)
+{
+ struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
+
+ rcar_thermal_irq_set(priv, false);
+
+ return 0;
+}
+
+static int __maybe_unused rcar_gen3_thermal_resume(struct device *dev)
+{
+ struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
+ unsigned int i;
+
+ for (i = 0; i < priv->num_tscs; i++) {
+ struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
+
+ priv->data->thermal_init(tsc);
+ rcar_gen3_thermal_set_trips(tsc, tsc->low, tsc->high);
+ }
+
+ rcar_thermal_irq_set(priv, true);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, rcar_gen3_thermal_suspend,
+ rcar_gen3_thermal_resume);
+
static struct platform_driver rcar_gen3_thermal_driver = {
.driver = {
.name = "rcar_gen3_thermal",
+ .pm = &rcar_gen3_thermal_pm_ops,
.of_match_table = rcar_gen3_thermal_dt_ids,
},
.probe = rcar_gen3_thermal_probe,
projects / karo-tx-linux.git / blobdiff